In this eye—grabbing book, readers learn all about rovers and landers. Short paragraphs of easy—to—read text are paired with plenty of colorful photos to make reading engaging and accessible. The book also includes a table of contents, fun facts, sidebars, comprehension questions, a glossary, an index, and a list of resources for further reading. Apex books have low reading levels (grades 2–3) but are designed for older students, with interest levels of grades 3–7.